The 1996 Summer Olympics torch relay was run from April 27, 1996, until July 19, 1996, prior to the 1996 Summer Olympics in Atlanta. The route covered 26,875 kilometres (16,699 mi) across the United States and included a trek on the Pony Express, a ride on the Union Pacific Railroad, and a torch was taken into outer space for the first time. The relay involved over 12,000 torchbearers, including Muhammad Ali, who was chosen to ignite the Olympic cauldron.